Relatively displacing apparatus

Abstract

A relatively displacing apparatus including a movable member and a stationary member which has a coating layer disposed adjacent to the movable member, formed by flame spray coating and including at least one selected from the group consisting of hexagonal system boron nitride and ceric oxide. Since the coating layer is easily machined with the movable member, the coating layer comes to have a surface generated by machining with the movable member and the clearance between the movable member and the stationary member is made zero (0) substantially when the movable member and the stationary member displace relatively at a high temperature. Thus, the efficiency of the relatively displacing apparatus has improved. In addition, since the coating layer has a high thermal shock resistance, the durability of the relatively displacing apparatus has improved.

What is claimed is: 
     
       1. A relatively displacing apparatus comprising: a movable member; and   a stationary member;   said movable member and said stationary member disposed adjacent to each other and displacing relatively at a high temperature;   said stationary member having a coating layer disposed adjacent to said movable member, said coating layer being formed by flame spray coating, including hexagonal system boron nitride and having a surface generated by machining with said movable member.   
     
     
       2. The relatively displacing apparatus according to claim 1, wherein said coating layer includes said boron nitride by 5 to 45% by volume. 
     
     
       3. The relatively displacing apparatus according to claim 1, wherein said boron nitride has an average particle size of 5 to 50 μm. 
     
     
       4. The relatively displacing apparatus according to claim 1, wherein said coating layer includes said ceric oxide by 10% by volume or more. 
     
     
       5. The relatively displacing apparatus according to claim 1, wherein said ceric oxide has average particle size of 10 to 100 μm. 
     
     
       6. The relatively displacing apparatus according to claim 1, wherein said coating layer further includes at least one oxide selected from the group consisting of zirconium oxide, yttrium oxide and aluminum oxide. 
     
     
       7. The relatively displacing apparatus according to claim 6, wherein said oxide has an average particle size of 10 to 100 μm. 
     
     
       8. A relatively displacing apparatus comprising: a movable member; and   a stationary member;   said movable member and said stationary member disposed adjacent to each other and displacing relatively at a high temperature;   said stationary member having a coating layer disposed adjacent to said movable member, said coating layer being formed by flame spray coating, including ceric oxide and having a surface generated by machining with said movable member.   
     
     
       9. The relatively displacing apparatus according to claim 8, wherein said coating layer further includes at least one oxide selected from the group consisting of zirconium oxide, yttrium oxide and aluminum oxide. 
     
     
       10. The relatively displacing apparatus according to claim 9, wherein said one oxide has an average particle size 10 to 100 μm. 
     
     
       11. The relatively displacing apparatus according to claim 8, further including an adhesion-improving alloy layer on said stationary member, said coating layer being formed in said alloy layer. 
     
     
       12. The relatively displacing apparatus according to claim 1, further including an adhesion-improving alloy layer on said stationary member, said coating layer being formed in said alloy layer.